Classification of Lull 1921

Or. †Ornithischia Seeley 1888 [ornithischian]
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Subor. †Stegosauria Marsh 1877
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Fm. †Nodosauridae Marsh 1890
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G. †Ankylosaurus Brown 1908
G. †Hierosaurus Wieland 1909
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†Hierosaurus sternbergii Wieland 1909
G. †Hoplitosaurus Lucas 1902
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†Hoplitosaurus marshi Lucas 1901
G. †Nodosaurus Marsh 1889
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†Nodosaurus textilis Marsh 1889
G. †Polacanthus Fox 1866
G. †Stegopelta Williston 1905
Invalid names: Predentata Marsh 1894 [synonym]